Warning: SPOILERS for Wolverine #26The Deadpool.
After decades of searching for a place of their own, 2019 brought about the biggest change to the X-Men since Giant-Sized X-Men in 1975: the Krakoa reboot. Created by Jonathan Hickman, the establishment of an island nation for mutants and only mutants changed the mutant status quo irrevocably. Professor X and Magneto were always working together, ever since their first meeting, to build the new nation (and every fight was retconned into a "disagreement" regarding precisely how to go about it). The gates of Krakoa, positioned all over the world, prevent any unauthorized human entry; they could only through if they were accompanied by mutants.
But Wolverine #26, written by Benjamin Percy with art by Juan Jose Ryp, throws a wrench into the gears of the perfectly-tuned security system. Wolverine, after being summoned by Beast for a mission, tosses an object to his friend's daughter: a severed finger. "This here's the finger of a guy named Wade Wilson," says Wolverine. "That's your key to Krakoa. It'll get you through the gates." With that, Wolverine leaves the scene - and in the process, leaves behind a massive clue to the readers that Krakoa is not nearly as safe as it ought to be.
Humans Can Invade Krakoa, And Mutants Are In Danger
Leaving aside the fact that Wolverine apparently regularly keeps Deadpool's fingers on hand, the scene proves that a mutant doesn't have to be living in order to gain access to Krakoa. Indeed, any part of any mutant can allow humans to through the gates...and the X-Men often fight many battles abroad. It would be a trivial matter for human to retrieve mutant DNA after these fights and use it as an organic key of sorts; from there, a human army can march right through the gates and into Krakoa.
Persumably, other security measures are in place too - chief among them, the absurd number of supremely-powerful mutants who can destroy armies with one action (Storm, Jean Grey and Magneto to name a few). But the fact remains that the gates themselves are vulnerable. Wolverine granting Deadpool's severed finger to a human may seem like a harmless gesture (if a tad morbid), but followed to its logical extreme, anyone with even a small amount of mutant DNA can walk through the gates of Krakoa just as easily as Logan himself.
